Adhesive cement



r Patented Mar. 8; 1932 UNITED STATES Examifii PATENT OFFICE FBEDRICK J. WALLACE, OF BROOKLYN, NEW YORK, ASSIGNOR TO BOBESON IROOESS COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY ADHESIVE CEMENT No Drawing.

This invention relates to adhesive cements; and it comprises a tacky, quick drying hard cement having good moisture resisting properties and applicable as a cement fpr linoleum and oilcloth; said cementum-fume by admifiure of so ca'seimcor m' uncentrated was e su te 1 uorandcla said cemerit belng usua y cac fiLsfll ew at with sodium a cid sulfiteamfi also usually clontain- 10 mg a small amount 0 either water ass solutio Inc a little 1 cerine being sometimes I 0 e 0 improve tack; all as more fully hereinafter set forth and as claimed.

Waste sulfite. liur from pulp making,

neu ra ize nntrated to about 50 Xper cent solids is a commercial article and i is used as an adhesive. For some purposes it is admixed with cla A pulped mixture of sulfite liquor an o ay is used as a linoleum cement and is desirable for that purpose.

Sometimes instead of pulping clay with the 50 per cent liquor, dry clay and dried sulfite liquor are mixed. This composition on the addition of water gives the same cement. Made in either way, the composition works well but it is susceptible of improvement. The present invention represents such an improvement.

I have found that such a composition containing some sodium caseinate in admixture together with I per ceiit'oTs'Fo'i either w perlass or glue gives better results. Tlie admixture istacky and quick drying. The tack can be still further improved by addition of a little glycerin; say a percent or so. On drying the newtomposition, with or without the glycerin, gives a hard cement layer of good moisture resisting properties.

In a specific embodiment of the present 40 invention the improved cement is made by dissolving 2 parts by weight of commercial c in a solution of caustic soda or other convenient alkaline medium and adding the sodium caseinate thus formed to about 4. parE by weight of commercial neutral waste Application filed September 13, 1930. Serial No. 481,810.

mixture at this time is a good cement. Its I cclccfr can pe consicgerably improved by the a 1tion o 2 parts y wei ht of acid sodium sulfite and this additioii is customarily ma e. In addition to bleaching the mixture the acid sodium sulfite seems to cause some other reactions which are advantageous. To the mixture as so far described I next add 1 part by weight 0 commercial sirupy waterlass solution alternatively, 1 part by welght of any c eap animal Inc. The composition produced W1 1; waterglass is somewhat different from that produced with glue. Each has its specific advantages. Where the highest tack is required, the

glue is better. With either composition, an

addition of 1 or 2 per sent by weight of commercial g cerin is a vantageous as giving increasegt zfc kf'l therefore often add about this amount of glycerin to the compositions made as described. The above composition contains about 2 per cent of casein or about 1 part of casein to 11 parts of waste sulfite liquor solids. Even such minimal quantities are sufiicient to greatly improve the adhesive and moisture resistant properties of the composition.

Instead of using the commercial 39 sulfite liquor dried sulfite liquor solids can tr mantra. saai'samne'easaistation added and then the cla Or I may mix the 5 dried solids with dry 0 ay, moisten the mixture with alkaline casein solution and add water. The proportion $65551? to the sulfite s'dlids may be varied within rather wide limits but one part by weight of gaseig to 10 9 or 12 parts of the sulfite solids has been found adequate to improve lor the present purposes the adhesive properties of the latter to a marked degree and to increase materially the moisture resisting power of sulfite liquor cements. While addition of a small quantity either of wategglassflozfi of lug is advantageous, it is not indispensab'f Commercial casein is soluble in a wide JLC'Hrrt'- .M, n .m H in A variety Of alkaline SuluinOus, a Duluth) of 10. The composition of claim 8 to which there is added about 1 per cent of glue.

11. The composition of claim 8 to which tlliere is added about 1 per cent or waterg ass.

12. The composition of claim 8 to which there is added about 1.to 2 per cent of glycerm.

In testimony whereof, I have hereunto affixed my signat re FRED'RIcK J. WALLACE.

- 1. An adhesive cement comprising amix- 7 ture of waste sulfite liquor in a concentration of about B. with casein solution and clay dispersed in the mixture.

21' In making adhesive cement containing the solids of waste sulfite wood extract, the

30 step which comprises incorporating in the cement one part by weight of casein to about 10 to12 parts of said extract solids.

3. In making adhesive cement containing the solids of waste sulfite wood extract, the

5 steps which comprise incorporating in the cement one part by weight of casein to about 10 to 12 parts of said extract solids and bleachin the cement by incorporating therein a small quantity of sodium acid sulfite.

40 4. The composition of claim 1 to which 7 has been added about 1 per cent of an adhesive agent selected from a class consisting of glue and waterglass. 5. The composition of claim 1 which has been bleached by *the addition of minimal amounts of acid sodium sulfite.

6. An adhesive cement comprising waste sulfite liquor, clay and casein in about the proportions by weight of 44 parts of 30 B sulfite liquor, 51 parts of clay and 2 parts of casein.

7. An adhesive cement comprising clay pulped with waste sulfite liquor and containing about one part of casein to about 10 to' 55 12 parts of the waste sulfite solids. 7 8. Anadheslve cement comprisin a m1x-" ture of clay pulped with a waste sul te wood extract and minimal quantities of a casein solution, the casein present being in suificient quantity to improve the adhesive and moisture resistant properties of the cement.

9. The composition of claim 8 to which there is added about 1 per cent of an adhesive agent selected fromia class consisting of glue 66 and waterglass. 

